The gang is bored hanging in the basement, so Randy spices things up by taking everyone out to the local burger joint. But after the grumpy owner causes them grief, Randy seeks revenge by stealing the restaurant's mascot, Fatso the Clown. His idea is a hit until the stolen clown stunt turns into a circus act for the gang.

'Tis the season for a Christmas party, so Freddie invites his neighbors in the complex to celebrate with his family and friends. But when a jealous neighbor reports to the board that Freddie is breaking the rules by having too many people living in his condo, Freddie has to get a petition signed by the majority of the tenants allowing them to stay. However, when Freddie goes door to door, he realizes his neighbors share no good will towards his family, who has not been very conscientious - but can he win them over now?

Sydney is reunited with Vaughn after being kidnapped and put in a hypnotic state in order to retrieve information from the depths of her mind. But unbeknownst to Sydney, her captor is a familiar face with a vested interest in Sydney's future and the future of her unborn child.

While Gideon is sidelined on crutches at FBI headquarters, Hotchner and the BAU go to Tennessee in an attempt to get inside the mind of a psychotic killer whose disorganized and erratic fantasies lead him to murder.

The cell works out a deal with white supremacists so they can acquire a large amount of explosives. The LAPD then sets up a surveillance on Darwyn after Gayle contacts them, which endangers his cover and gets the FBI's attention.

The designers are excited when they learn that they will be designing an outfit for a fashion icon. Their curiosity is peaked when to find out what the challenge is they go on a field trip. Ending up in front of the Toys R'Us flag ship store in New York, they soon learned that the fashion icon they would be designing for was non other then the ageless Barbie, specifically for the My Scene Barbie. Each designer received a doll to take as a muse while they worked. While Kara was flinging her doll around on the way out of the store, she lost the hat for her doll in-between the escalator and the wall. Deciding that it was important to her to have it she lost important sketching time to go back to the store and find it.

Half way through the challenge the designers are treated to another surprise. Lily Martinez, from Matel comes to Parsons to let them know that the winner of this challenge will have dolls made and sold with their winning design, as well as their name and picture on the side of the box!

You're either in, or you're out, who was out this week... NIck is the winner and Heidi and Raymundo is Out.

Danny and Stella find innovative ways to process a crime scene while Danny is trapped in a panic room with the victim, who was the only person with the security code. As a locksmith works to cut through the titanium doors, the CSIs rush to process the evidence before the victim decays further and Danny's oxygen runs out. Meanwhile, Mac, Dr. Hawkes and Lindsay investigate the murder of an exotic dancer found dead on a klieg light

TONIGHT: Stephen Colbert welcomes actor and star of The Family Stone, Dermot Mulroney!

Martin is surprised when his parents visit out of the blue, but they bring unwelcome tidings for all, especially Aunt Joan, who may be driven out of her home. School secretary Maureen receives better news when her thyroid problem turns out to be a pregnancy. Louisa calls the doctor when Danny collapses - but the ambulance is delayed and Ellingham must perform emergency surgery to save his life.